Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 752, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.141829
Keywords
Coastal rivers; Sediment; Inorganic sulfur; Organic sulfur; Buffer capacity
Categories
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA23050203]
- National Natural Science Foundation of China [41373100]
- Key Project of Research and Development Plan of Yantai [2018ZHGY080]
- Key Research and Development Program of Shandong Province [2019GSF109002]
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The study found that organic sulfur dominated in coastal river surface sediments, correlated with labile organic matter and reactive iron. Terrigenous inputs and sulfurization were the main sources of sulfur enrichment, while acid volatile sulfur and chromium-reducible sulfur were the major components of reduced inorganic sulfur.
Geochemical processes of sulfur (S) in river aquatic systems play a crucial role in environmental evolution. In this study, the distributions and sources of reduced inorganic sulfur (RIS) and organic sulfur (OS) in coastal river surface sediments were investigated. The results indicated that OS dominated total S (80%), and OS (i.e., humic acid sulfur, HAS; fulvic acid sulfur, FAS) correlated with the availability of labile organic matter (OM) and reactive iron (Fe). Terrigenous inputs and sulfurization contributed to the enrichment of FAS through the S reduction. Autochthonous biological inputs were potential sources of HAS from S oxidization. The X-ray photoelectron spectroscopy showed that the main sources of S in surface sediments were deposited as the form of organic ester-sulfate. Aquatic life could break S down further, producing reduced S compounds accumulated as thiols and RIS in anoxic sediments. RIS was dominated by acid volatile sulfur (AVS) and chromium (II)-reducible sulfur (CRS). Reactive Fe oxides were major control factors for the conversation from hydrogen sulfide (H2S) to AVS, whereas elemental sulfide (ES) controlled the conversion from AVS into CRS in coastal rivers. (C) 2020 Elsevier B.V. All rights reserved.
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